set in 2001, two years after the events of diamond is unbreakable, koichi hirose is sent to italy and tasked by jotaro kujo to search for giorno giovanna, an aspiring mafia gangster who is a son of dio brando. but as dio possessed the body of jonathan joestar at time of his conception, giorno is technically a joestar and takes more after them than the father he never knew, despite his blond hair. the series follows giorno as he joins the mafia organization passione, moving up through its ranks with the intention of becoming its boss to improve life in italy. through the series, it reveals that the boss has placed bruno bucciarati's group with his daughter, trish una, so that he may kill her to protect his identity. after bucciarati suffers grievous injuries from the boss'king crimson, he, giorno, and the majority of the gang find ways of defeating the boss. they eventually find an ally named jean pierre polnareff, who helped in killing giorno's father 13 years ago, eventually giving the gang a trump card, a stand arrow. giorno uses the stand arrow, defeats the boss, and becomes the new boss of passione, as seen in the finale. 